Audi A5 License Plate Bulb Size

The Audi A5 license plate light uses a DE3423 bulb size for the specific illumination area. Data for the bulb size covers the range from 2010 through 2014.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Type	Shop
2014	DE3423	Check Price
2010-2012	DE3423	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V.	DE3423	Check Price

Other Locations

Additional Notes

The Audi A5 uses the DE3423 bulb for its license plate lighting across the 2010-2012 and 2014 model years.
The DE3423 is a festoon-type bulb, meaning it is cylindrical in shape and makes electrical contact through metal caps at each end rather than through a base socket or pins.
The DE3423 has a length of 41mm, which is the critical fitment factor for festoon bulbs, as the housing cavity must match this length for the end caps to make proper contact.
This bulb operates at 12 volts, consistent with standard automotive electrical systems.
The DE3423 designation follows ANSI standards recognized in both the United States and Canada, indicating a defined and regulated specification for voltage, size, and contact type.
Because festoon bulbs rely on physical length for contact rather than a keyed base, substituting a festoon bulb of a different length, even with the same voltage rating, would result in a poor or failed connection in the Audi A5 license plate housing.